package com.heima.media.service.impl;

import com.baomidou.mybatisplus.core.conditions.Wrapper;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.heima.common.dto.PageResponseResult;
import com.heima.common.dto.ResponseResult;
import com.heima.common.enums.AppHttpCodeEnum;
import com.heima.media.dto.ChannelDto;
import com.heima.media.entity.WmChannel;
import com.heima.media.mapper.WmChannelMapper;
import com.heima.media.service.IWmChannelService;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.util.Date;

@Service
public class WmChannelServiceImpl extends ServiceImpl<WmChannelMapper, WmChannel> implements IWmChannelService {
    @Override
    public ResponseResult listByPage(ChannelDto dto) {
        // 分页查询频道列表
        // 构建查询条件
        LambdaQueryWrapper<WmChannel> query = new LambdaQueryWrapper<>();
        // 如果频道名称为空,查询所有
        // 如果频道名称不为空,添加名称的查询
        if (!StringUtils.isEmpty(dto.getName())) {
            query.like(WmChannel::getName, dto.getName());
        }
        // 构建分页条件
        IPage<WmChannel> page = new Page<>(dto.getPage(), dto.getSize());
        IPage<WmChannel> iPage = page(page, query);
        // 返回通用的分页响应
        PageResponseResult result = new PageResponseResult(dto.getPage(), dto.getSize(), iPage.getTotal(), iPage.getRecords());
        return result;
    }

    @Override
    public ResponseResult saveChannel(WmChannel channel) {
        // 判断参数是否为空
        if (channel == null || StringUtils.isEmpty(channel.getName())) {
            // 提示参数不正确
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
        }
        // 判断频道名称是否已经存在
        LambdaQueryWrapper<WmChannel> query = new LambdaQueryWrapper<>();
        query.eq(WmChannel::getName, channel.getName());
        int count = this.count(query);
        if (count > 0) {
            return ResponseResult.errorResult(AppHttpCodeEnum.DATA_EXIST);
        }
        // 表中没有,新增
        channel.setCreatedTime(new Date());
        this.save(channel);
        return ResponseResult.okResult();
    }
}
